If you’re still monitoring this thread? If your panels are the flexable polyethylene type that slide into metal channels, they come in various lengths, widths, and colors. Contact Kinkead Division of The Sterling Plumbing Group, Inc. 1375 Remington Road, Schaumburg, IL 60173
Mine are 12″s and 9″s wide and 65″s long. My supplier charges $20 per panel. I’ve been replacing them every 30 months. Not the best designed product but convient.